https://www.cnbc.com/2018/07/26/watch-facebooks-stock-trading-here.html

Facebook's stock is on track to suffer its worst day in six years as a public company after it reported a revenue miss and disappointing daily active user count Wednesday.

Shares opened nearly 20 percent lower Thursday, turning negative on the year. The stock fell to a session low of $174.78 in the first 15 minutes of trading.